Perihelion

Today the Earth is closest to the Sun, a point called perihelion. We will be about 147,099,000km (91,403,000miles) from the Sun. Compare this to the 152,096,000km (94,508,000miles) we will be at aphelion on July 4th, a difference of about 4,996,000km (3,104,000miles) occurs throughout one orbit.

It may seem odd that we are actually at the closest for the middle of northern winter, you just have to remember that proximity to the Sun is not the cause of the seasons. The seasons are caused by the axial tilt of the Earth, creating short and long days throughout the year, with a resulting change in the angle and intensity of the sunlight.

2013 Solstices and Equinoxes
  UT HST
Perihelion Jan 2 00:59UT Jan 1 14:59HST
Spring Equinox Mar 20 11:02UT Mar 20 01:02HST
Summer Solstice Jun 21 05:04UT Jun 20 19:04HST
Apehelion Jul 5 18:59UT Jul 5 08:59HST
Fall Equinox Sep 22 20:44UT Sep 22 10:44HST
Winter Solstice Dec 21 17:11UT Dec 21 07:11HST
 
Source: NASA Sky Calendar

 

Darker View’s Top Posts of 2012

Looking through the site statistics is an interesting exercise. I get a chance to see what people are reading. The vast majority of readers do not write comments, the stats are the best tool for feedback I have. Perusing the stats is also an realization of one’s own vanity, a necessary motivation for all writers, not just bloggers.

Site traffic has taken a large hit with the transfer to the WordPress platform. I expected this, there would inevitably be loss of links and search engine traffic with the changeover. This has begun to recover, but very slowly. There have been 55 thousand views of the Darker View blog in 2012. Overall there were 66 thousand views of the entire site for the year, not just the WordPress material. This compares to 91 thousand visitors in 2011, about two-thirds of pre-changeover traffic. Total traffic to Darker View since inception in 2007 is now over 288 thousand visitors.

Continue reading “Darker View’s Top Posts of 2012”

2012 in Photos

For your viewing pleasure, here are some of the best photos from Darker View assembled into a gallery. New Year is a time for reviewing the year past. I have enjoyed the last year, with the photos to prove it. I hope that 2013 brings you the chance to collect your own gallery of photos and memories.

Christmas Eve Diving

What else would I do on a Christmas Eve? Go shopping? Not really my ideal plan for the day. What about going diving? Not a bad idea at all…

Pete and I had already planned to go diving, but the plan had been to go shore diving somewhere. Then Dennis extended an invitation to join him on the boat, a gracious invitation we quickly accepted. As a result, the morning of the 24th saw us leaving Honokohau Harbor looking for a dive site to try.

Facing the Deep
Pete attempting to photograph garden eels at the base of the reef at Eel Cove
The surf was definitely up a bit, with a long swell rocking the boat and breakers hitting the rocks. Conditions in the water were pretty nice, visibility to near 100ft and just a gentle surge to be felt nearer the shore.

We did not go far from the harbor. First choice was a dive site called Sharkfin Rock just off Old Airport Park about two miles south of Honokohau. It is always a good sign when you can see the bottom 60 feet below through the blue water. Just inshore from the mooring a few surfers enjoyed the breaks along the park. Except for the one bodyboarder who was yelling at us to stop blocking his waves, as if a mere boat can have any significant effect on waves of any real size!

Strobe Effects
Pete imitating an old fashioned photographer with his strobe held away from the camera
The second site was a spot even closer to the harbor, a site called Eel Cove. The little indent in the shoreline that is right at the tip of the peninsula that protects Honokohau Harbor from the south. It is a very exposed site that drops off steeply. The cove offered just a bit of protection from the southerly swell and gave access to great diving conditions.

Eel Cove Profile
A typical Hawaiian dive profile, start deep and work your way up
The sites we dove this day allow access to deep water, we dropped to the base of the coral reef and explored our way up the slope. At Eel Cove there were indeed garden eels below 80ft on the sand slope. We dropped down to see them for a few minutes before heading back up the slope.

We found nothing truly unusual.. There were a number of nice encounters with reef regulars, some uncommon species of butterflyfish, a large day octopus, a young whitemouth moray. The second site at Eel cove was definitely one of the fishiest sites I have seen in quite a while. A lot of young fish to be seen. I expect the the more exposed site offers good feeding opportunities and less abuse from the aquarium collectors. I got a few good photos, particularly of the octopus. I have not seen what results Pete got from his efforts.

The day was simply a nice day to be out on the water, with good dive conditions that provided two nice dives. In the end I did do a little shopping. A stop at Costco was convenient as it is right above the harbor. There I grabbed a quick lunch and a couple things to keep our refrigerator stocked over the holiday.

Quadrantid Meteor Shower

The first meteor shower of 2013 is the annual Quadrantid meteor shower. The Quadrantids are a reliable shower, producing 60-120 ZHR, one to two meteors per minute. The Quadrantids are named for the obsolete constellation Quadrans Muralis, now part of the constellation Boötes.

Unlike other showers where activity can occur for days or even weeks, the Quadrantids have a sharp peak, activity falls off rapidly on the preceding and following nights, or even a few hours away from the peak. Thus it is important to observe the Quadrantids quite near the peak prediction. For 2013 the peak is predicted for January 3rd around 13:33UT, or 03:33HST on this side of the globe, excellent timing. This is the good news for observers here in Hawai’i. The bad news is that the peak will be sullied by the light of a bright last quarter Moon.

Watching meteors requires no more equipment than your eyes and a dark sky, and can be enjoyable for just about anyone. While the viewing conditions for this year’s Quadrantids are possibly spoiled by moonlight, it may still be worth a peek. Set the alarm early?